Add instructions how to "uninstall" astronvim

[sieste]

Is your feature related to a problem?

I followed the instructions to install astronvim, backing up the .config/nvim and .local/share/nvim subdirectories. After playing around with it I wanted to go back to my old nvim configuration. I moved the backed up subdirectories back to their original names. Now whenever I open nvim I get a long list of errors like

line   35:
E117: Unknown function: plug#begin
line   37:
E492: Not an editor command: Plug 'jpalardy/vim-slime'
line   39:
E492: Not an editor command: Plug 'ap/vim-buftabline'
line   41:
E492: Not an editor command: Plug 'itchyny/calendar.vim'
line   43:
.....

and all my plugins are broken.

Describe the new feature

Document how to completely undo the astronvim installation and recover the previous nvim configuration.

Additional context

No response

[sieste]

It seems like vim-plug was removed during my installation/deinstallation of astronvim. Reinstalling vim-plug with curl -fLo ~/.config/nvim/autoload/plug.vim --create-dirs https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim fixed the issue.

[mehalter]

Yeah it looks like you have something going on on your machine that is not good. AstroNvim does not use vim-plug

[mehalter]

Finished in the latest commit to v4 branch